POST request to Instagram API using fetch(), throws Error

Question

I'm using fetch to retrieve data from Instagram API for authorization

Need access token in response to the request.

But, got error : {"error_type": "OAuthException", "code": 400, "error_message": "You must provide a client_id"}

const url = 'https://api.instagram.com/oauth/access_token';

let fetchData = {
            method: 'POST', 
            body: JSON.stringify({
              'client_id': 'xxxxxxxxxxxxxxxxxxxxxxx',
              'client_secret': 'xxxxxxxxxxxxxxxxxxxxxxx',
              'grant_type': 'authorization_code',
              'redirect_uri':'http://localhost:3000/',
              'code':'xxxxxxxxxxxxxxxxxxxxx'
            })
}

fetch(url, fetchData)
        .then((response) => {
          console.log(response, "::response")
          return response.json();
        }).catch((error) => {
          console.log(error," :: ERROR");
          return error;
        });